The article describes the case of a 5-year-old boy who presented with fever and rash. Doctors performed a detailed diagnosis, including a physical examination, laboratory tests, and imaging methods to determine the cause of the symptoms. They ruled out common infectious diseases and focused on less common causes of fever-related rash. Diagnosis was based on clinical symptoms and test results that indicated a specific disease. Treatment was tailored according to the diagnosed disease and included supportive care and specific therapy. During hospitalization, the child's condition improved and the rash subsided. The article emphasizes the importance of a comprehensive approach in the diagnosis of children with fever and rash to avoid misdiagnosis and inappropriate treatment.